Abstract
Freeze-drying is a deceptively complex operation requiring sophisticated design of a robust and efficient process that includes understanding and planning for heterogeneity across the batch and shifts in parameters due to vial or lyophilizer changes. A software tool has been designed to assist in process development and scale-up based on a model that includes consideration of the process heterogeneity. Two drug formulations were used to test the ability of the new tool to develop a freeze-drying cycle and correctly predict product temperatures and drying times. Model inputs were determined experimentally, and the primary drying heterogeneous freeze-drying model was used to design drying cycles that provided data to verify the accuracy of model-predicted product temperature and primary drying time. When model inputs were accurate, model-predicted primary drying times were within 0.1 to 15.9% of experimentally measured values, and product temperature accuracy was between 0.2 and 1.2°C for three vial locations, center, inner edge, and outer edge. However, for some drying cycles, differences in vial heat transfer coefficients due to changes in shelf and product temperature as well as altered product resistance due to product temperature-dependent microcollapse increased inaccuracy (up to 28.6% difference in primary drying time and 5.1°C difference in product temperature). This highlights the need for careful determination of experimental conditions used to calculate model inputs. In future efforts, full characterization of location- and shelf temperature-dependentKv as well as location- and product temperature-dependentRp will enhance the accuracy of the predictions by the model within the user-friendly software.
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Funding
This work was performed under a Project Award Agreement from the National Institute for Innovation in Manufacturing Biopharmaceuticals (NIIMBL) and financial assistance award 70NANB17H002 from the US Department of Commerce, National Institute of Standards and Technology. Drug substance was provided at no cost by Genentech and Merck.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Robin Bogner, Emily Gong, William Kessler, and Arushi Manchanda. Michael Hinds developed the software. Jessie Zhao, Puneet Sharma, Akhilesh Bhambhani, and Justin Stanbro provided drug substance. The first draft of the manuscript was written by Robin Bogner, Emily Gong, and William Kessler, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Supplementary Information
Supplemental Figure 1
Lyophilization primary drying process modeling software Graphical User Interface used to fit product resistance data and determine product resistance parameters R0, A1 and A2. (PNG 7365 kb)
Supplemental Figure 2
Product resistance to drying, Rp, at Ldry = 2/3 Lmax as a function of the average product temperature during primary drying for Formulation B. (PNG 4040 kb)
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Bogner, R., Gong, E., Kessler, W. et al. A Software Tool for Lyophilization Primary Drying Process Development and Scale-up Including Process Heterogeneity, I: Laboratory-Scale Model Testing. AAPS PharmSciTech 22, 274 (2021). https://doi.org/10.1208/s12249-021-02134-3
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DOI: https://doi.org/10.1208/s12249-021-02134-3